Multidimensional gas chromatographic enantiomer quantification of some chlorinated xenobiotics in cod liver and fish oils

Four chiral HRGC column systems for the separation of selected organochlor pesticides and photoconversion products (heptachlor, cis- and trans-chlorda ne, o,p'-DDT, o,p'-DDD, and alpha-HCH) were tested. Cod liver oil and fish oil samples from different countries were comparatively analyzed. Of all th ese columns, the fourth was the most suitable one for the analysis of the s elected compounds. The enantiomer ratios [ER] of cis-chlordane, trans-chlor dane, photodieldrin, alpha-HCH, and o,p'-DDD in fish oils are nearly 1.0, w hile the ERs of the same substances are significantly different from 1.0 in cod liver oils. Contrary to that, the ER values of o,p'-DDT are remarkable different from 1 in the cod liver oils as well as in the fish oils. (C) 19 99 Elsevier Science Ltd. All rights reserved.